The Happycake project is done now. Here's a summary of the game taken
from the design document:

A group of mech-style robots, varying in size
(from twice human size, up to about 100 feet tall for the master robot) are
moving across the terrain to attack a human city. When they get to the
city, they will destroy it. The players are humans trying to halt this
attack. The robots are generally too big and well-armored to be destroyed
outright, so the humans must focus their weapons on soft points like the
robots' joints. The goal is to damage and destabilize the robots enough
that they fall. Secondary attacks should play a large role, such as
blocking or tripping robots with other fallen robots, or knocking heavy
pieces of the environment onto the robots to damage them. Robots attack
players with ballistic weaponry, and also try to crush players beneath legs
and wheels.

(Unfortunately, some aspects of the design document are secret so I can't
post the whole thing.)

Other people involved with the game were: Atman Binstock as the other main
programmer; Jennifer Estaris in a production role; Ethan Abramson, Clay Sparks,
Matt Vitalone, Jorge Hernandez, and Peter Kim doing the various kinds of visual
art; and the folks at dSonic doing audio.